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Small optimization for partial unpacks, won't make a noticable difference, but every little helps :P 

git-svn-id: http://pcsx2.googlecode.com/svn/trunk@4527 96395faa-99c1-11dd-bbfe-3dabce05a288
This commit is contained in:
refraction 2011-04-02 20:16:00 +00:00
parent ec41e24228
commit 44a1d17c9d
1 changed files with 27 additions and 11 deletions
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38
pcsx2/x86/newVif_Unpack.cpp
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@ -144,19 +144,35 @@ _vifT int nVifUnpack(const u8* data) {
// to read back from it mid-transfer. Since so few games actually use partial transfers
// of VIF unpacks, this code should not be any bottleneck.
while (size >= vSize) {
--vifRegs.num;
++vif.cl;
// We can optimize the calculation either way as some games have big partial chunks (Guitar Hero).
// Skipping writes are easy, filling is a bit more complex, so for now until we can
// be sure its right (if it happens) it just prints debug stuff and processes the old way.
if(!isFill)
{
vifRegs.num -= (size / vSize);
}
else
{
int guessedsize = (size / vSize);
guessedsize = vifRegs.num - (((guessedsize / vifRegs.cycle.cl) * (vifRegs.cycle.wl - vifRegs.cycle.cl)) + guessedsize);
if (isFill) {
if (vif.cl <= vifRegs.cycle.cl) size -= vSize;
else if (vif.cl == vifRegs.cycle.wl) vif.cl = 0;
}
else
{
size -= vSize;
if (vif.cl >= vifRegs.cycle.wl) vif.cl = 0;
while (size >= vSize) {
--vifRegs.num;
++vif.cl;
if (isFill) {
if (vif.cl <= vifRegs.cycle.cl) size -= vSize;
else if (vif.cl == vifRegs.cycle.wl) vif.cl = 0;
}
else
{
size -= vSize;
if (vif.cl >= vifRegs.cycle.wl) vif.cl = 0;
}
}
DevCon.Warning("Fill!! Partial num left = %x, guessed %x", vifRegs.num, guessedsize);
}
}